Synchronicity (or meaningful coincidence) has been at the forefront of both Trish and Rob's journalistic output for the last bunch of years. The cover the topic well, with a focus on the stories as well as the speculation of what it might mean. Their latest book, a follow up to
Aliens in the Backyard, is
The Synchronicity Highway, with the sub-title, Exploring Coincidence, the Paranormal and Alien Contact.
(link)